This elegant residence and its walled garden are a rare and well-preserved example of a country estate in early 19th-century Canada. Built from 1831-1834 for William Thomson, a prosperous farmer, its centrepiece is this finely crafted home in the British classical tradition. The oval entrance drive and the walled garden of nearly half a hectare reflect the original pattern of the grounds. The sheltered environment for growing household vegetables, tender fruit and flowers recalls the walled gardens common in Britain.

The house is now owned by the National Capital Commission and it is a designated national historic site. Since 1999 the Maplelawn Manor has been the location of the Keg Manor restaurant. Today the house is located in Westboro at 529 Richmond Road.